Improvement in ceooss foe musical insteumeits



@nit-eh taies @anni @frn ISAAC FISKE, CF WORCESTER, MASSACHUSETTS. Letters Patent No. 70,824, dated November 12, 1867.

IMPROVEMENT IN GROOKS FOR MUSICAL INSTRUMENTS.

ite Signale referat in in these' Titten @that mit making uut nf tige sume.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, ISAAC FISKE, of Worcester, in the county of Worcester, and State of Massachusetts, have invented an Improved Crook for Musical Inctrnments; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description elA my invention sufficient to enable those skilled in the art to practise it.

As crooks or return-bends for eornets and similar wind musical instrument have been heretofore made, each was constructed of two pieces, each semi-tubular or semicircular in form or eross-seetion, and each bent so that its ends stood tangcntially to the parallel pipes or tubes to be connected by the bend, these two pieces being matched and joined together at their corresponding converse edges by brazing or solder. This process, however, is a very troublesome one, and requires nice manipulation and aconsiderable time to match the pieces and make a tightjoint. Moreover, the joint on the outer portion of the bend is on a surface continually exposed to abrasion and blows, and the metal being bent, the joint soon cracks open.

The object of my invention is to obviate these diiiculties, by forming the entire bend from one piece of metal, and in such manner that there is no joint formed on the extreme convex end surface of the crook, and my invention consists in a crook or return-bend for musical instruments, made of one piece of metal, cutout, bent, and struck up in dies, into the propei` form for closing the joints.

The drawings will serve to illustrate the improved crook, and the method of constructing it.

I first out from sheet metal a blank of the form shown at A. This blank I place upona bed-die, having sunk in it a concave recess or matrix of the form of the end of the bend, the blank being placed on the die, as shown at A, (wherein the dotted lines represent the die in plan,) with a corresponding male die or former; I then strike down the blank into thc recess ofthe bed-die, thereby stretching the metal at the centre of' the blank, and bending the blank' into the form substantially as shown at B and C, the former of whiclrshows an end view, and the latter a side view ofthe blank-crook. I then drop into the blank a solidsteel arbor or mandrel, circular in cross-scction, and scmicircular in form, or in the direction of its length, or of the form ofthe interior vof the finished crook, and with a pointed mallet, or with hard-wood pincers, I force thc inner edges of the crook down around the inner surface of the arbor. I then place the crook in a circular half die, (as seen by `the full and dotted lines at 1),) and placca corresponding die upon it, (as seen at E,) the die surfaces corresponding in form to the finished form to be imparted to the crook, and then, by means of a press, I bring the dies together, and the inner surfaces of the blank down against the steel arbor. 'lhis finishes the crook,\(with the exception of closing the joint with solder,) giving to the crook the finished form seen at D and l", and in cross-section at C, the corresponding edges being perfectly matched and abutted, and the end surface of the crook being left whole or free from any joint. The arbor is then driven out, the joints are closed with solder, and the crook is ready for application to the instrument.

It will bc obvious that I not only obtain, by this method of forming the crook, the advantages above set forth, but thatI can make the crooks of more uniform calibre throughout the length of each, than where each is made of two pieces joined together.

I claim a crook for musical instruments, made of one piece of metal, and formed into shape, substantially as set forth.

ISAAC FISKE. Witnesses HARTLEY WILLIAMs, WM. B. IIARDING. 

